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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cd3fce6b646df89a8f7e86949358b454b59097d3acaea6c88c9f7913e56804' 
  AND token = 'WH1H8W0iqzs4VinuFPQuWihtxQlYYu1nvs+dBFDa724=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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