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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e611f19fd2d96503b91e0303a8f3f40cb21a635a3f6bae5a0b3bece5b0e6a770' 
  AND token = 'YBDY5pCzBven0R7xmXL9RIUnnC+VXZaE4nJy5Kd4RM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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