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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cd5932938456f117f08fdc1d38f6be45efc4a2c7b2ef3e7da8dcc22a82f2b5' 
  AND token = 'kDJa3PrQXjB587e5jvumx+eUeIT6D4eDLVgubgQvLIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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