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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517594b5569ae730fdd9ecbf46328dff918485fc09ded089bfff85f62f551a42' 
  AND token = 'r52gU27hi1KAdxmlZaP3RM0xRz4httPALxz5uZJzcHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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