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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6ac64fa32215c6f6c6852b5582e942cc3b2fd3d8b1a1e80b044a55890c7ddc9' 
  AND token = 'jg7foYs+PdXcyjnf9vFQ9doQ03Rk6Ec6l5h8UfDYHg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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