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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc0f611c943805f15c8eea159ff01a096b2736a519b35628c3a9eecc55721ca8' 
  AND token = 'iuShJyoT1jlzfJErzYcK/fcSx9/vR8CZIFyUNHtw/Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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