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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8519c16b0c3e78fcc628691c7b90493c5fd90ae8a17c8239726d05061807bdc8' 
  AND token = 'R6O8ahNzrsB7nCcQz8TqO+qtDLLnS440Q8v27pPTFCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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