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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee77e3170c2a277b8f84dd4246664d50aecc1ece99d6517800803e42a277122' 
  AND token = 'zlwc4J3NzuSY+PyJ90Ts6x2LjryQdRuILre21TLdjy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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