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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d480eec579f9e9911be1ed418766f95728d723ea76122b54bb8749f760c55d4' 
  AND token = '435D5x+gPnX5PFJbwD1O4D9dWWYcoh05kYlh66QLlgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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