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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae5c4fb6dfe4618e15592a012df7fde8f05550fce161d35fc8401b2611f65b57' 
  AND token = 'oyPhbdMFHLQbjYv28aBnx1H39aNCp3d64zFjD11H2SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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