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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0384b642d2b835ecccdd3d1d2f18f1eda6020e0061ed48c6e4297495a5d25d' 
  AND token = 'VPCsF5Xscx+57e1Y6Cn9bqF2kuH+6KaKWPwZmvVAkuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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