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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7febc1eda3b2c0b1815570bf3963b54b76be51325f6e881d6b4f90daac4d21f3' 
  AND token = '2NgDydp7D/Ddc3+58F4Dj1TWBPHP8gjwcVTRH8GgoW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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