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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ad4e30a5dd8879304a4b135c82fd82f1e0f4f9d6abfb7758bd2b512e97dd455' 
  AND token = '7FxWfhNyOUOZScn2ssnZ0P5uDrE96xVnGLadBV4z1Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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