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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7d1a6f0c633c96855ff68aeb09ba545a2bc82456b7dde0744ce988bf7d8314' 
  AND token = 'mDnJzK5jSbxBrVq8zhfAmYarXTmh6Rv8y41usuPcESI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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