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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb3a82729a9474001afbc0d854996c2f44a7f63915e6353fc53b4fe7f9c0791' 
  AND token = '+NJu3/38Q1B0yBR5RTFZPpzUigcnOlte6wDQcbg5hP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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