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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ef775d1039543fd7f17cb4a67ac676b6d0f36d9e2cdfeec41ff0ca86592fe0' 
  AND token = '9L1OTgiDjrz6gMiTISUyzrw3tkdIfovK3GIXS7qKrCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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