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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '496e5d36e101d42f17119d9c6ac750e5ad16a5c332ce978a5d557aa37ed48b3e' 
  AND token = 'j1dD8lKuQVrKCqlmZVp8rOoIwUIzkcA/cex+n4H77f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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