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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e142962276f4b9c9c030db35fd0d046b0c490a687f8bcd1b7b4a6d33963fa4' 
  AND token = 'CkrHJkA8nPz3JiaJLDnUortW1YcRfKlMqvl5evnXkPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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