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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a2524be83450760ebcabeee6a3c4842c1cd8a8ede776e0c139858376b0d8059' 
  AND token = 'JIF19bicTx4+IoZ8mIr+fuANhnsL06C1WMFpb7Q1nWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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