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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c73b2d0b6f88bcdb20bbdc36fb62a76a64126e4a41cda8d21e944b23dff386f' 
  AND token = 'M55CZ4G+6Hrzm/nsueqFMUpteJCkbCCOfSJxHSbZKKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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