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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d890d0c7a8d0da05fa81922ba440100a13edcecbbb20d20bf1fa7d3e3e170d' 
  AND token = 'Aslu86FxYgZCCqsgLqjAKYekdBU5CbaH+n+imHTp4zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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