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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b10d7aa6e506c4bf6c243f401d0308ef6fc3a9ec120464d85dd38b113ac994' 
  AND token = 'y6bnFyPDP7YWC2qWdRnfMmcqLcLBkNrsiKbpWOsr2O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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