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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef06b6f3438a188d80e1eaccfd021e1d6e2a77f25895ed1c54db559547d749c0' 
  AND token = 'HHwhIZyd8ahfgF0JvqlahmElffUCNqvOr9YcDb7+cD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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