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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f248fa5aada8285fd2b5d3909532b41b19f6eb99014cc027613a0af3f83524' 
  AND token = '5WNwWDZRkPbHkR1xkvkzvubBa+lZWy0L8TQP7/yC4f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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