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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4bcb3798202a71ac30a778d49ae56c8e0838cd5ae381af3441e1899462e2d5f' 
  AND token = 'q0b8SX/erVfyim5nrUIYTp4KbGONnDDbj/DamYCRLWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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