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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f9fb0a9227c1930740c04c021a49092f3bbc293c98896392a7cfddf0e30cd1' 
  AND token = 'mX97wGol5zc2jL/g3r2OCUoL4jMIrlzO+Gy0TsZ4EHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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