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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd70570f864cf54b2a1857fce8b0db758fba89d6c0560147ef13c46c3e05a28' 
  AND token = 'TFxOTQtOkEd8gctdPysiCTwu3x9XlFJW1Ta8yWip5RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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