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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ff1109f04ebe8a0d6e9887bb7f3bccc19701dd0b45debd8d4f528fa5a2c44d' 
  AND token = 'uKr9WxfuzTCz9Var8eyCzraLoTQyB03pf+V6sje+63w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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