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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f7bf14f65b4d1cd2160514c7fbe598c0787e8679e88e312ef3bdfd8bad74b8' 
  AND token = '8K7iqavdQvioPgm6uiFomuidGSQYAnFUEMu6qdMsDgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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