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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbe963f29ebbe0f0c16270a113a49560e8abe5ce6b6e5da75010c5cbfc2a2cc' 
  AND token = 'SsM50x7EFwjWUpar90q0PoIb1ZIf0wpvSkpF4gNMWUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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