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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd806a1064258d6a00422ba7acf1ce10b8f749f27ce703c61d757ea3a3f2d77' 
  AND token = 'RVxXuQ98b6XDXv88nILCECABaUQEfCAlFm0JWYsY5Ns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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