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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58f648915453d764f9883338a330b651d51938b93b4ca7dfad85e003d47d44e' 
  AND token = 'eGbcPDq5LVUvQow+7H5TIk4hrna9fLa2kvVTYAMIep4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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