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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d423f574fceccc5c2c1e70d3f70c601f3ed9f49c4ed905348a7815576e2012' 
  AND token = 'bGtKqgSXM6y4kG+ebppcDXruSks6X9rWZCeDfx92aFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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