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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73669ca9fa01c3a03593971f9dfbc3033019e27baea0e315813540b1f4f2577b' 
  AND token = '7L9la+VxZdv5G/gTwvWTep6eNLbPNb9UM7G6Jr0XaMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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