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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308291a0f0b87ce84bd1a58a459fbbe35a8fce3277719d5448f5388f6411c745' 
  AND token = 'TheJIgAIIw9Y1W2RvulSzcQxxNd0E8pobFTGQTRUvjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}