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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9ddf33d17a25a1f16c05156ea31ddcf346a7e74d85357e67b068214daa5f45' 
  AND token = '7yxOXIS66G18FUONBYQddToq/rOEQ5m3ES/dOedUN40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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