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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d1e9f131adef8eedc23e60823082682706f6deb0a0082c147e20987d703b0b' 
  AND token = 'NKVjIRq3q8RiXeyIA9ZaKOFu9d3vwko8pv7kTSEpEFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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