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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ae999afeab7222e1282b919f7aebc0c6e15bb04036a9e6a5a7fb742b1e1db2' 
  AND token = 'euzTtKrykRom9QBGO4lXGAGl/TzgX972ETwWmNo9FLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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