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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '896473f44dd8b95e532f8d919e15e32b8a32f158e64e5efefac3c9301a65ac44' 
  AND token = 'FpGrSplNdMeqbwgR9t8PYnYA2xozjx+t1lD/1JAKzpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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