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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af1f93028b87b29c86aca900816443b63de2aa1f2f22f8be28f201b664a68892' 
  AND token = 'lAnuoj9NGqRrGgfndh1z87P81KJKCot3pOCzZch9FXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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