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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca0a212b5b6b64bec85cbaa7500861f70196eaf8cd8066618ddc10fc5338358' 
  AND token = 'xc8NjF54PJRd5nNZyypIF5iHns9RSfIbY1p0R/E+NqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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