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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295b39743b1dfc3f421d069cde60826798d836560ab94a7ee5383d6bcc04bbd7' 
  AND token = 'G7yxrcZXPW5y1BP3cqk1HejxOxATG0nI8zr0EARW5E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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