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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e8980e5ad94a776a0964b68375840dc7fca6e8dbd6d7cad81db75cd5fc676f' 
  AND token = 'nEulMNkxV5eycl20R9y1kOqbmdAXS5RTDzzzSrivj6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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