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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a61990255a477850e9f4107ec603d0b61b1dbed8b0ec0bbd7ae141241e7b8e' 
  AND token = '6aA9yGjOr8LavYxyezB3VQaW37q3SNfH9eLRGYga8gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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