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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6bdc7a5629206b9c01abafd6f6a369e7c7359b511dbbeeac8de71c7793c778' 
  AND token = 'NOUE1LhU7YkX4ivZ++Ma6t9AkaM7S8Znqb5p8Sj52BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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