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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea4601df9f957a8fd46ea572557bd0474a7b577373f73acef2584c3ca0c9ec9' 
  AND token = 'fqAo21NbLAW1LZ5NVLC2CAu/i230u4XM+Xhb8jpGZzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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