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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7081d1f6562a1bd795b67cc415c456e0247d23ad8611313b8f76d6b92adcd15' 
  AND token = 'h4ezN3TB6oHPeHGhPinZN84YGEwiN7Jy744Jo+OJEF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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