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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd47022dc823f43c5e95559734df399fe75d374f015ecd2cd4b0b603d075aaa' 
  AND token = 'm1A5Hg9a9FF0IS2LwUSbd9HPWcWvLE/Kp7AlK6r6qbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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