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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae260bd7b73ccc65195a5444150c52b5790d2f047ab81af481d59ffbc5565d80' 
  AND token = 'H1evgk6/dxdwdS14/CbDG+Zd4D+zAApU3o0wSFpyvRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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