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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1681b53c1c6ea973d7ca304de47dd7bdd6c48a6b77833034174945973ce9096' 
  AND token = 'K5RXokc3L/BXYyPz++RPp4Np1JGMrl62cweWSQgZO3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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