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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b4a6d2f1cff926bf652cc3fe543aec046cadec0f1fe346f6bd74dccf08133d' 
  AND token = '1VrPBQt5RjtjDOFWcGiXa8sTLbVdzFzC0/FkC4KSSyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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