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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ac0f7fe9d824bb80f6d48e2fb56d67d4b45f4aaa8eff89f31c92772bd7ae52' 
  AND token = 'PeKAJBiGMyp6Kg0yvG8/Ad3Sv2KHTe8NhN76Kv9LBPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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