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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83086fe2eb9153d0fc9a666c984749b4bcea70e9904ecd4038057f7ec167888c' 
  AND token = 'cQC6KZ3oCTz88awa2ksFLM20xd4Uxa+NoNYHhHijvHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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