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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc62e708f0e66f5626c9b2a45dfa00dbe2527167e7337f8997ae157173262e47' 
  AND token = '9nTQ6LSCSG3Pp29UVGCMn6RJAvK/nCltxo9F3skJs1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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