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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3ca6381bb89deabc4cbfc4a2dec24d2815d1f190538cc2d69e1243faee079a' 
  AND token = 'RAVdkcne3rm6AbIn0AMCyrvfaO4X+Akb74wlcUuJlCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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