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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2ce26ba5d75e026b37117856f30d37391e370d414c2b557707f0a63f454454c' 
  AND token = 'pKrNJCPKFt959a+iyQXXNefe6T5MuDJJqjPKyTV5V94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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