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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475a5543edecd5770a71e01f5149945e05a327d9ffc2079357cc75d521ffc61d' 
  AND token = 'TNyLVtcqB2N9ZqoQstNfTFOnC9ZAf/pwqmVT253xuVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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